Barao had his 32-fight streak snapped by Dillashaw in May at UFC 173. Given his dominance over the past nine years, the Brazilian was granted an instant sequel with Dillashaw, who easily served up the biggest upset special this year in MMA.

Unfortunately for Barao, and fans who bought tickets or already ordered UFC 177 on pay-per-view, Barao passed out trying to cut weight and was pulled from the tango just hours before weigh-ins.

Dillashaw went on to steamroll last-second substitute Joe Soto that night.

Gagnon is perfect through his past four outings. He is 11 days removed from submitting Roman Salazar in Canada.